HumanSoftware has introduced BoosterElements for Photoshop Elements 1 or 2 on Mac OS X or Mac OS 9.x. The product is a set of three filters that brings features such as masking, curves, color changes, and effects (including sepia or duotones) to Photoshop Elements.
With the mask element, you can silhouette images via density (especially fur, hair, and trees). The mask element features a brush with which you can create a mask. The curves element lets you adjust a shadow or perform a color correction in a tonal range. The SWAP element’s multiple options let you create duotone, multitones, and sepia versions of an image.
Booster Elements costs US$29.95. HumanSoftware also makes a variety of other plug-ins for Photoshop Elements and Adobe Photoshop.